Oil to top up manual steering gearbox?

Hi Experts
I have a 1984 240D and want to top up the oil in the manual steering
gearbox. The manual does not specify any brand of oil and the maintenance

manual says that the local MBZ rep will advise which brands are suitable. I
called the local rep and asked about the brands and was told "we have a
quart of it here for $15."
My guess is that something like SAE90 gear oil would be ok. Suggestions
appreciated.
RF

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